-
Anael Beutot authored
sending events on removed domains or sending removed event too late.
Anael Beutot authoredsending events on removed domains or sending removed event too late.
__init__.py 33.35 KiB
import logging
import weakref
from StringIO import StringIO
from itertools import chain, imap
from xml.etree import cElementTree as et
import libvirt
from sjrpc.utils import threadless
from cloudcontrol.node.host import Handler as HostHandler
from cloudcontrol.node.tags import Tag, tag_inspector, get_tags
from cloudcontrol.node.hypervisor import tags
from cloudcontrol.node.hypervisor.lib import (
DOMAIN_STATES, EVENTS, STORAGE_STATES,
EventLoop as VirEventLoop,
)
from cloudcontrol.node.hypervisor.domains import VirtualMachine
from cloudcontrol.node.exc import UndefinedDomain, PoolStorageError, DRBDError
from cloudcontrol.node.hypervisor.jobs import (
ImportVolume, ExportVolume, TCPTunnel, DRBD,
)
logger = logging.getLogger(__name__)
# FIXME find a way to refactor Handler and Hypervisor class
class Handler(HostHandler):
def __init__(self, *args, **kwargs):
"""
:param loop: MainLoop instance
:param hypervisor_name: hypervisor name
"""
self.hypervisor_name = kwargs.pop('hypervisor_name')
HostHandler.__init__(self, *args, **kwargs)
#: keep index of asynchronous calls
self.async_calls = dict()
self.timer = self.main.evloop.timer(.0, 5., self.virt_connect_cb)
self.hypervisor = None
self._virt_connected = False
# register tags
self.tag_db.add_tags(tag_inspector(tags, self))
@property
def virt_connected(self):
return self._virt_connected
@virt_connected.setter
def virt_connected(self, value):
self._virt_connected = value
# update tags
for tag in ('vir_status', 'sto', 'nvm', 'vmpaused', 'vmstarted',
'vmstopped', 'hvver', 'libvirtver', 'hv'):
self.tag_db['__main__'][tag].update_value()
def start(self):
self.timer.start()
HostHandler.start(self)
def stop(self):
self.timer.stop()
if self.hypervisor is not None:
self.hypervisor.stop()
HostHandler.stop(self)
def virt_connect_cb(self, *args):
# initialize hypervisor instance
try:
self.hypervisor = Hypervisor(
name=self.hypervisor_name,
handler=self,
)
except libvirt.libvirtError:
logger.exception('Error while connecting to libvirt')
return
self.virt_connected = True
# register hypervisor storage tags
for name, storage in self.hypervisor.storage.storages.iteritems():
self.tag_db.add_tags((
Tag('sto%s_state' % name, lambda: storage.state, 5, 5),
Tag('sto%s_size' % name, lambda: storage.capacity, 5, 5),
Tag('sto%s_free' % name, lambda: storage.available, 5, 5),
Tag('sto%s_used' % name,
lambda: storage.capacity - storage.available, 5, 5),
Tag('sto%s_type' % name, lambda: storage.type, 5, 5),
))
# register domains
for dom in self.hypervisor.domains.itervalues():
self.tag_db.add_sub_object(dom.name, dom.tags.itervalues())
self.rpc_handler.update(dict(
vm_define=self.vm_define,
vm_undefine=self.vm_undefine,
vm_export=self.vm_export,
vm_stop=self.vm_stop,
vm_start=self.vm_start,
vm_suspend=self.vm_suspend,
vm_resume=self.vm_resume,
))
self.main.reset_handler('vm_define', self.vm_define)
self.main.reset_handler('vm_undefine', self.vm_undefine)
self.main.reset_handler('vm_export', self.vm_export)
self.main.reset_handler('vm_stop', self.vm_stop)
self.main.reset_handler('vm_destroy', self.vm_destroy)
self.main.reset_handler('vm_start', self.vm_start)
self.main.reset_handler('vm_suspend', self.vm_suspend)
self.main.reset_handler('vm_resume', self.vm_resume)
self.main.reset_handler('vm_migrate_tunneled', self.vm_migrate_tunneled)
self.main.reset_handler('vol_create', self.vol_create)
self.main.reset_handler('vol_delete', self.vol_delete)
self.main.reset_handler('vol_import', self.vol_import)
self.main.reset_handler('vol_import_wait', self.vol_import_wait)
self.main.reset_handler('vol_export', self.vol_export)
self.main.reset_handler('tun_setup', self.tun_setup)
self.main.reset_handler('tun_connect', self.tun_connect)
self.main.reset_handler('tun_connect_hv', self.tun_connect_hv)
self.main.reset_handler('tun_destroy', self.tun_destroy)
self.main.reset_handler('drbd_setup', self.drbd_setup)
self.main.reset_handler('drbd_connect', self.drbd_connect)
self.main.reset_handler('drbd_role', self.drbd_role)
self.main.reset_handler('drbd_takeover', self.drbd_takeover)
self.main.reset_handler('drbd_sync_status', self.drbd_sync_status)
self.main.reset_handler('drbd_shutdown', self.drbd_shutdown)
# if everything went fine, unregister the timer
self.timer.stop()
def virt_connect_restart(self):
"""Restart libvirt connection.
This method might be called when libvirt connection is lost.
"""
if not self.virt_connected:
return
logger.error('Connection to libvirt lost, trying to restart')
# update connection state
self.virt_connected = False
# unregister tags that will be re registered later
for storage in self.hypervisor.storage.storages:
self.tag_db.remove_tags((
'sto%s_state' % storage,
'sto%s_size' % storage,
'sto%s_free' % storage,
'sto%s_used' % storage,
'sto%s_type' % storage,
))
# unregister sub objects (for the same reason)
for sub_id in self.tag_db.keys():
if sub_id == '__main__':
continue
self.tag_db.remove_sub_object(sub_id)
# stop and delete hypervisor instance
self.hypervisor.stop()
self.hypervisor = None
# remove handlers related to libvirt
self.main.remove_handler('vm_define')
self.main.remove_handler('vm_undefine')
self.main.remove_handler('vm_export')
self.main.remove_handler('vm_stop')
self.main.remove_handler('vm_destroy')
self.main.remove_handler('vm_start')
self.main.remove_handler('vm_suspend')
self.main.remove_handler('vm_resume')
self.main.remove_handler('vm_migrate_tunneled')
self.main.remove_handler('vol_create')
self.main.remove_handler('vol_delete')
self.main.remove_handler('vol_import')
self.main.remove_handler('vol_import_wait')
self.main.remove_handler('vol_export')
self.main.remove_handler('tun_setup')
self.main.remove_handler('tun_connect')
self.main.remove_handler('tun_connect_hv')
self.main.remove_handler('tun_destroy')
self.main.remove_handler('drbd_setup')
self.main.remove_handler('drbd_connect')
self.main.remove_handler('drbd_role')
self.main.remove_handler('drbd_takeover')
self.main.remove_handler('drbd_sync_status')
self.main.remove_handler('drbd_shutdown')
# launch connection timer
self.timer.start()
def iter_vms(self, vm_names):
"""Utility function to iterate over VM objects using their names."""
if vm_names is None:
return
get_domain = self.hypervisor.domains.get
for name in vm_names:
dom = get_domain(name)
if dom is not None:
yield dom
def vm_define(self, data, format='xml'):
logger.debug('VM define')
if format != 'xml':
raise NotImplementedError('Format not supported')
return self.hypervisor.vm_define(data)
def vm_undefine(self, name):
logger.debug('VM undefine %s', name)
vm = self.hypervisor.domains.get(name)
if vm is not None:
vm.undefine()
def vm_export(self, name, format='xml'):
logger.debug('VM export %s', name)
if format != 'xml':
raise NotImplementedError('Format not supported')
vm = self.hypervisor.domains.get(name)
if vm is None:
return
return vm.lv_dom.XMLDesc(0)
def vm_stop(self, name):
logger.debug('VM stop %s', name)
try:
self.hypervisor.domains[name].stop()
except libvirt.libvirtError:
logger.exception('Error while stopping VM %s', name)
raise
except KeyError:
msg = 'Cannot stop VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_destroy(self, name):
logger.debug('VM destroy %s', name)
try:
self.hypervisor.domains[name].destroy()
except libvirt.libvirtError as exc:
# Libvirt raises exception 'domain is not running' event is domain
# is running, might be a bug in libvirt
if 'domain is not running' not in str(exc) or (
self.hypervisor.domains[name].state != 'running'):
logger.exception('Error while destroying VM %s', name)
raise
except KeyError:
msg = 'Cannot destroy VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_start(self, name):
logger.debug('VM start %s', name)
try:
self.hypervisor.domains[name].start()
except libvirt.libvirtError:
logger.exception('Error while starting VM %s', name)
raise
except KeyError:
msg = 'Cannot start VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_suspend(self, name):
logger.debug('VM suspend %s', name)
try:
self.hypervisor.domains[name].suspend()
except libvirt.libvirtError:
logger.exception('Error while suspending VM %s', name)
raise
except KeyError:
msg = 'Cannot suspend VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_resume(self, name):
logger.debug('VM resume %s', name)
try:
self.hypervisor.domains[name].resume()
except libvirt.libvirtError:
logger.exception('Error while resuming VM %s', name)
raise
except KeyError:
msg = 'Cannot resume VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_migrate_tunneled(self, name, tun_res, migtun_res, unsafe=False):
"""Live migrate VM through TCP tunnel.
:param name: VM name to migrate
:param tun_res: result of tunnel_setup handler
:param migtun_res: result of tunnel setup handler
:param unsafe: for Libvirt >= 0.9.11, see
http://libvirt.org/html/libvirt-libvirt.html#virDomainMigrateFlags
"""
logger.debug('VM live migrate %s', name)
try:
remote_virt_port = tun_res['port']
except KeyError:
logger.error('Invalid formatted argument tun_res for live'
' migration')
raise
try:
remote_hv_port = migtun_res['port']
except KeyError:
logger.error('Invalid formatted argument migtun_res for live'
' migration')
raise
try:
vm = self.hypervisor.domains[name]
except KeyError:
logger.exception('Cannot find domain %s on hypervisor for live'
' migration', name)
raise
try:
dest_virt_con = libvirt.open(
'qemu+tcp://127.0.0.1:%d/system' % remote_virt_port)
except libvirt.libvirtError:
logger.exception('Cannot connect to remote libvirt for live'
' migrating vm %s', name)
raise
try:
if unsafe:
# VIR_MIGRATE_UNSAFE is not defined for libvirt < 0.9.11
append_flags = getattr(libvirt, 'VIR_MIGRATE_UNSAFE', 0)
else:
append_flags = 0
vm.lv_dom.migrate(
dest_virt_con,
libvirt.VIR_MIGRATE_LIVE | libvirt.VIR_MIGRATE_PEER2PEER |
libvirt.VIR_MIGRATE_TUNNELLED |
libvirt.VIR_MIGRATE_PERSIST_DEST |
libvirt.VIR_MIGRATE_UNDEFINE_SOURCE |
append_flags,
None,
'qemu+tcp://127.0.0.1:%d/system' % remote_hv_port,
0,
)
except libvirt.libvirtError:
# FIXME maybe we should catch some weird crap libvirt bad exception
logger.exception('Libvirt error while live migrating vm %s', name)
raise
finally:
dest_virt_con.close()
logger.debug('Sucessfuly live migrated vm %s', name)
def vol_create(self, pool, name, size):
logger.debug('Volume create %s, pool %s, size %s', name, pool, size)
try:
self.hypervisor.storage.create_volume(pool, name, size)
except Exception:
logger.exception('Error while creating volume')
raise
def vol_delete(self, pool, name):
logger.debug('Volume delete %s, pool %s', name, pool)
try:
self.hypervisor.storage.delete_volume(pool, name)
except Exception:
logger.exception('Error while deleting volume')
raise
def vol_import(self, pool, name):
"""
:param pool: pool name where the volume is
:param name: name of the volume
"""
logger.debug('Volume import pool = %s, volume = %s', pool, name)
try:
pool = self.hypervisor.storage.get_storage(pool)
if pool is None:
raise Exception('Pool storage does not exist') # TODO exc
volume = pool.volumes.get(name)
if volume is None:
raise Exception('Volume does not exist')
# create the job
job = self.main.job_manager.create(ImportVolume, volume)
job.start()
except Exception:
logger.exception('Error while starting import job')
raise
return dict(id=job.id, port=job.port)
def vol_import_wait(self, job_id):
"""Block until completion of the given job id."""
job = self.main.job_manager.get(job_id)
logger.debug('Waiting for import job to terminate')
job.wait()
logger.debug('Import job terminated')
return dict(id=job.id, log='', checksum=job.checksum)
def vol_import_cancel(self, job_id):
"""Cancel import job."""
logger.debug('Cancel import job')
job = self.main.job_manager.get(job_id)
self.main.job_manager.cancel(job_id)
# wait for job to end
job.join() # we don't call wait as it is already called in
# vol_import_wait handler
def vol_export(self, pool, name, raddr, rport):
"""
:param pool: pool name where the volume is
:param name: name of the volume
:param raddr: IP address of the destination to send the volume to
:param rport: TCP port of the destination
"""
pool = self.hypervisor.storage.get_storage(pool)
if pool is None:
raise Exception('Pool storage does not exist')
volume = pool.volumes.get(name)
if volume is None:
raise Exception('Volume does not exist')
try:
job = self.main.job_manager.create(ExportVolume, volume, raddr, rport)
# we don't run the job in a background thread thus exceptions are
# sent to the sjRPC
job.start_current()
# otherwise we would do
# job.start()
# job.join()
except Exception:
logger.exception('Error while exporting volume')
raise
logger.debug('Export volume successfull')
return dict(id=job.id, log='', checksum=job.checksum)
@threadless
def tun_setup(self, local=True):
"""Set up local tunnel and listen on a random port.
:param local: indicate if we should listen on localhost or all
interfaces
"""
logger.debug('Tunnel setup: local = %s', local)
# create job
job = self.main.job_manager.create(TCPTunnel, self.main.evloop)
job.setup_listen('127.0.0.1' if local else '0.0.0.0')
return dict(
jid=job.id,
key='FIXME',
port=job.port,
)
@threadless
def tun_connect(self, res, remote_res, remote_ip):
"""Connect tunnel to the other end.
:param res: previous result of `tun_setup` handler
:param remote_res: other end result of `tun_setup` handler
:param remote_ip: where to connect
"""
logger.debug('Tunnel connect %s %s', res['jid'], remote_ip)
job = self.main.job_manager.get(res['jid'])
job.setup_connect((remote_ip, remote_res['port']))
@threadless
def tun_connect_hv(self, res, migration=False):
"""Connect tunnel to local libvirt Unix socket.
:param res: previous result of `tun_setup` handler
"""
logger.debug('Tunnel connect hypervisor %s', res['jid'])
job = self.main.job_manager.get(res['jid'])
job.setup_connect('/var/run/libvirt/libvirt-sock')
@threadless
def tun_destroy(self, res):
"""Close given tunnel.
:param res: previous result as givent by `tun_setup` handler
"""
logger.debug('Tunnel destroy %s', res['jid'])
self.main.job_manager.cancel(res['jid'])
self.main.job_manager.remove(res['jid'])
def drbd_setup(self, pool, name):
"""Create DRBD volumes.
:param pool: storage pool
:param name: storage volume name
"""
pool = self.hypervisor.storage.get_storage(pool)
if pool is None:
raise DRBDError('Cannot setup DRBD: pool storage does not exist')
elif pool.type != 'logical':
raise DRBDError('Cannot setup DRBD: pool storage is not LVM')
volume = pool.volumes.get(name)
if volume is None:
raise DRBDError('Cannot setup DRBD: volume does not exist')
try:
job = self.main.job_manager.create(DRBD, self.hypervisor.storage,
pool, volume)
except Exception:
logger.exception('Error while creating DRBD job')
raise
job.setup()
logger.debug('DRBD setup successfull')
return dict(
jid=job.id,
port=job.drbd_port,
)
def drbd_connect(self, res, remote_res, remote_ip):
"""Set up DRBD in connect mode. (Wait for connection and try to connect
to the remote peer.
:param res: previous result of `drbd_setup` handler
:param remote_res: result of remote `drbd_setup` handler
:param remote_ip: IP of remote peer
"""
job = self.main.job_manager.get(res['jid'])
job.connect(remote_ip, remote_res['port'])
job.wait_connection()
def drbd_role(self, res, primary):
"""Set up DRBD role.
:param res: previous result of `drbd_setup` handler
:param bool primary: if True, set up in primary mode else secondary
"""
job = self.main.job_manager.get(res['jid'])
if primary:
job.switch_primary()
else:
job.switch_secondary()
def drbd_takeover(self, res, state):
"""Set up DRBD device as the VM disk. FIXME
:param res: previous result of `drbd_setup` handler
:param state: FIXME
"""
job = self.main.job_manager.get(res['jid'])
job.takeover()
def drbd_sync_status(self, res):
"""Return synchronization status of a current DRBD job.
:param res: previous result of `drbd_setup` handler
"""
status = self.main.job_manager.get(res['jid']).status()
result = dict(
done=status['disk'] == 'UpToDate',
completion=status['percent'],
)
logger.debug('DRBD status %s', result)
return result
def drbd_shutdown(self, res):
"""Destroy DRBD related block devices.
:param res: previous result of `drbd_setup` handler
"""
logger.debug('DRBD shutdown')
job = self.main.job_manager.get(res['jid'])
job.cleanup()
# remove job from job_manager list
self.main.job_manager.notify(job)
class Hypervisor(object):
"""Container for all hypervisor related state."""
def __init__(self, name, handler):
"""
:param str name: name of hypervisor instance
:param Handler handler: hypervisor handler
"""
self.handler = weakref.proxy(handler)
#: hv attributes
self.name = name
self.type = u'kvm'
# register libvirt error handler
libvirt.registerErrorHandler(self.vir_error_cb, None)
# libvirt event loop abstraction
self.vir_event_loop = VirEventLoop(self.handler.main.evloop)
# This tells libvirt what event loop implementation it
# should use
libvirt.virEventRegisterImpl(
self.vir_event_loop.add_handle,
self.vir_event_loop.update_handle,
self.vir_event_loop.remove_handle,
self.vir_event_loop.add_timer,
self.vir_event_loop.update_timer,
self.vir_event_loop.remove_timer,
)
self.vir_con = libvirt.open('qemu:///system') # currently only support KVM
# findout storage
self.storage = StorageIndex(handler, self.vir_con)
logger.debug('Storages: %s', self.storage.paths)
#: domains: vms, containers...
self.domains = dict()
# find defined domains
for dom_name in self.vir_con.listDefinedDomains():
dom = self.vir_con.lookupByName(dom_name)
self.domains[dom.name()] = VirtualMachine(dom, self)
# find started domains
for dom_id in self.vir_con.listDomainsID():
dom = self.vir_con.lookupByID(dom_id)
self.domains[dom.name()] = VirtualMachine(dom, self)
logger.debug('Domains: %s', self.domains)
self.vir_con.domainEventRegister(self.vir_cb, None) # TODO find out args
def stop(self):
self.vir_event_loop.stop()
# unregister callback
try:
self.vir_con.domainEventDeregister(self.vir_cb)
except libvirt.libvirtError:
# in case the libvirt connection is broken, it will raise the error
pass
ret = self.vir_con.close()
logger.debug('Libvirt still handling %s ref connections', ret)
# TODO delet objects
def vir_error_cb(self, ctxt, err):
"""Libvirt error callback.
See http://libvirt.org/errors.html for more informations.
:param ctxt: arbitrary context data (not needed because context is
givent by self
:param err: libvirt error code
"""
logger.error('Libvirt error %s', err)
def vir_cb(self, conn, dom, event, detail, opaque):
"""Callback for libvirt event loop."""
logger.debug('Received event %s on domain %s, detail %s', event,
dom.name(), detail)
event = EVENTS[event]
if event == 'Added':
# update Storage pools in case VM has volumes that were created
self.storage.update()
if dom.name() in self.domains:
# sometimes libvirt send us the same event multiple times
# this can be the result of a change in the domain configuration
# we first remove the old domain
vm = self.domains.pop(dom.name())
self.handler.tag_db.remove_sub_object(vm.name)
logger.debug('Domain %s recreated', dom.name())
vm = VirtualMachine(dom, self)
logger.info('Created domain %s', vm.name)
self.domains[vm.name] = vm
self.handler.tag_db.add_sub_object(vm.name, vm.tags.itervalues())
self.update_domain_count()
elif event == 'Removed':
self.vm_unregister(dom.name())
logger.info('Removed domain %s', vm.name)
elif event in ('Started', 'Suspended', 'Resumed', 'Stopped', 'Saved',
'Restored'):
vm = self.domains.get(dom.name())
# sometimes libvirt sent a start event before a created event so be
# careful
if vm is not None:
try:
state = DOMAIN_STATES[dom.info()[0]]
except libvirt.libvirtError as exc:
# checks that domain was not previously removed
# seems to happen only in libvirt 0.8.8
if 'Domain not found' in str(exc):
self.vm_unregister(dom.name())
else:
raise
else:
logger.info('Domain change state from %s to %s', vm.state,
state)
vm.state = state
self.update_domain_count()
def vm_unregister(self, name):
"""Unregister a VM from the cc-server and remove it from the index."""
try:
vm = self.domains.pop(name)
except KeyError:
# domain already removed, see hypervisor/domains/vm_tags.py
# sometimes libvirt send us the remove event too late
# we still update storage and tag attributes
pass
else:
self.handler.tag_db.remove_sub_object(vm.name)
# update Storage pools in case VM had volumes that were deleted
self.storage.update()
self.update_domain_count()
def update_domain_count(self):
"""Update domain state count tags."""
# update domain state counts
for tag in ('nvm', 'vmpaused', 'vmstarted', 'vmstopped'):
self.handler.tag_db['__main__'][tag].update_value()
def vm_define(self, xml_desc):
"""Create a VM on the Hypervisor
:param str xml_desc: XML description in libvirt format
:return: VM name created
"""
try:
return self.vir_con.defineXML(xml_desc).name()
except libvirt.libvirtError:
logger.exception('Error while creating domain')
# reraise exception for the cc-server
raise
def _count_domain(self, filter=lambda d: True):
count = 0
for dom in self.domains.itervalues():
if filter(dom):
count += 1
return count
@property
def vm_started(self):
"""Number of VMs started."""
return self._count_domain(lambda d: d.state == 'running')
@property
def vm_stopped(self):
"""Number of VMs stopped."""
return self._count_domain(lambda d: d.state == 'stopped')
@property
def vm_paused(self):
"""Number of VMs paused."""
return self._count_domain(lambda d: d.state == 'paused')
@property
def vm_total(self):
"""Total number of VMs on the hypervisor."""
return self._count_domain()
class StorageIndex(object):
"""Keep an index of all storage volume paths."""
def __init__(self, handler, lv_con):
"""
:param handler: Hypervisor handler instance
:param lv_con: Libvirt connection
"""
self.handler = handler
self.lv_con = lv_con
self.storages = dict(
(s.name, s) for s in imap(
Storage,
imap(
lv_con.storagePoolLookupByName,
chain(
lv_con.listDefinedStoragePools(),
lv_con.listStoragePools(),
),
),
),
)
self.paths = None
self.update_path_index()
def update(self):
"""Update storage pools and volumes."""
# go through all storage pools and check if it is already in the index
for lv_storage in imap(
self.lv_con.storagePoolLookupByName,
chain(
self.lv_con.listDefinedStoragePools(),
self.lv_con.listStoragePools(),
),
):
if lv_storage.name() in self.storages:
# update
self.storages[lv_storage.name()].update()
else:
# add storage pool
s = Storage(lv_storage)
self.storages[s.name] = s
# add tags
self.handler.tag_db.add_tags((
Tag('sto%s_state' % s.name, lambda: s.state, 5, 5),
Tag('sto%s_size' % s.name, lambda: s.capacity, 5, 5),
Tag('sto%s_free' % s.name, lambda: s.available, 5, 5),
Tag('sto%s_used' % s.name,
lambda: s.capacity - s.available, 5, 5),
Tag('sto%s_type' % s.name, lambda: s.type, 5, 5),
))
self.update_path_index()
def update_path_index(self):
self.paths = dict(
(v.path, v) for v in chain.from_iterable(imap(
lambda s: s.volumes.itervalues(),
self.storages.itervalues(),
)),
)
def get_volume(self, path):
return self.paths.get(path)
def get_storage(self, name):
return self.storages.get(name)
def create_volume(self, pool_name, volume_name, capacity):
"""Create a new volume in the storage pool.
:param str name: name for the volume
:param int capacity: size for the volume
"""
# get volume
logger.debug('asked pool %s', pool_name)
logger.debug('Pool state %s', self.storages)
try:
pool = self.storages[pool_name]
except KeyError:
raise PoolStorageError('Invalid pool name')
if pool is None:
raise Exception('Storage pool not found')
try:
new_volume = pool.lv_storage.createXML("""<volume>
<name>%s</name>
<capacity>%d</capacity>
</volume>""" % (volume_name, capacity), 0)
except libvirt.libvirtError:
logger.exception('Error while creating volume')
raise
new_volume = Volume(new_volume)
# if success add the volume to the index
self.paths[new_volume.path] = new_volume
# and also to its storage pool
self.storages[new_volume.storage].volumes[new_volume.name] = new_volume
return new_volume
def delete_volume(self, pool_name, volume_name):
"""Delete a volume in the givent storage pool.
:param str pool_name: name for the storage pool
:param str volume_name: name for the volume
"""
# get volume
try:
pool = self.storages[pool_name]
except KeyError:
raise PoolStorageError('Invalid pool name')
try:
volume = pool.volumes[volume_name]
except KeyError:
raise PoolStorageError('Invalid volume name')
# delete from index
del self.paths[volume.path]
del self.storages[pool_name].volumes[volume_name]
# delete volume
try:
volume.lv_volume.delete(0)
except libvirt.libvirtError:
logger.exception('Error while deleting volume')
raise
class Storage(object):
"""Storage abstraction."""
def __init__(self, lv_storage):
"""
:param lv_storage: Libvirt pool storage instance
"""
self.uuid = lv_storage.UUID()
self.name = lv_storage.name()
self.lv_storage = lv_storage
self.state, self.capacity = None, None
self.allocation, self.available = None, None
self.type = et.ElementTree().parse(
StringIO(lv_storage.XMLDesc(0))).get('type')
self.volumes = dict((v.name, v) for v in imap(
Volume,
(lv_storage.storageVolLookupByName(n) for n in
lv_storage.listVolumes()),
))
self.update_attr()
def update(self):
self.update_attr()
# update volumes
for vol_name in self.lv_storage.listVolumes():
if vol_name in self.volumes:
# update volume
self.volumes[vol_name].update()
else:
# add volume
v = Volume(self.lv_storage.storageVolLookupByName(vol_name))
self.volumes[v.name] = v
def update_attr(self):
self.state, self.capacity, self.allocation, self.available = self.lv_storage.info()
self.state = STORAGE_STATES[self.state]
self.type = et.ElementTree().parse(
StringIO(self.lv_storage.XMLDesc(0))).get('type')
class Volume(object):
"""Volume abstraction."""
def __init__(self, lv_volume):
"""
:param lv_volume: Libvirt volume instance
"""
self.storage = lv_volume.storagePoolLookupByVolume().name()
self.path = lv_volume.path()
self.name = lv_volume.name()
self.capacity, self.allocation = None, None
self.lv_volume = lv_volume
self.update()
def update(self):
self.capacity, self.allocation = self.lv_volume.info()[1:]